What are the 3 main types of enzymes used in the digestive system of the human body? Also what are their substrates and what they break down into??

1)proteases and peptidases split proteins into their monomers, the amino acids.
2)lipases split fat into three fatty acids and a glycerol molecule.
3)carbohydrases split carbohydrates such as starch and sugars into simple sugars such as glucose, the simplest sugar on earth.
4)nucleases split nucleic acids into nucleotides.
source:
http://en.wikipedia.org/wiki/Digestive_enzyme